I'm using the last version and I have some problems with the -copy option of some commands (like _move or _scale). The copy option autoactivate itself, even after I disabled it : I launch the command, click on copy to make it off, select my object, my cursor show the "+" symbol, I disable it one more time, and if there is one more step as for the scale command, I may have to do it one more time. I supposed first there was some mouse or keyboard trick but I didn't find it so I supposed it's a bug.
Pfff ... forget it, I searched all the keys but one minute after posting I found it was the "Alt" key I used all the time unlocking snap which control the copy option when pushed fast.
Right. tapping Alt in V5 toggles the copy option.
There is another related setting called RememberCopyOptions. It changes the 'sticky behavior' of the copy option within commands when you change it. Start the RememberCopyOptions command and tap F1 to get a list of the effected commands.